<https://www.cnn.com/travel/article/germany-9-euro-ticket-ending/index.html/#schema-author>
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<https://www.cnn.com/travel/article/germany-9-euro-ticket-ending/index.html>
<https://stluciachronicle.com/germanys-railways-offered-a-month-of-unlimited-rides-for-9-heres-what-happened/>